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Preparation method of chloroisopentene

A technology of chlorinated isopentene and isoprene, which is applied in the field of preparation of chlorinated isopentene

Inactive Publication Date: 2012-03-07
赵明江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of excessive hydrogen chloride and the use of the addition product as a diluent, it is impossible to fundamentally prevent the formation of by-product dichloroisopentane in the addition reaction process

Method used

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  • Preparation method of chloroisopentene
  • Preparation method of chloroisopentene

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Embodiment 1～8

[0015] The addition reaction was carried out in a 1000 ml glass three-neck flask with mechanical stirring and cooling device. Add isoprene into the three-necked flask, start stirring and cool the reaction liquid to the required temperature, then pass the raw material anhydrous hydrogen chloride gas into the reactor from the lower part at this temperature, keep the required reaction time, and make the hydrogen chloride and Isoprene undergoes an addition reaction. Since the addition reaction is an exothermic process, the gas inlet rate of hydrogen chloride should be controlled to maintain the reaction temperature. The reaction conditions of the above embodiments are shown in Table 1, and the reaction results are shown in Table 2.

[0016] Table 1.

[0017]

[0018] Table 2.

[0019]

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Abstract

The invention provides a preparation method of chloroisopentene. According to the invention, one component, or a mixture containing two components or a mixture containing more than two components selected from the group consisting of toluene, ethylbenzene, hexane, cyclohexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, heptane and the like is used as a solvent; an addition reaction between isoprene and hydrogen chloride is carried out to generate chloroisopentene while the mass ratio of the solvent to isoprene is (0.2-10): 1; the mol ratio of isoprene to hydrogen chloride is 1: (0.5-1.0); the reaction temperature is minus 5-10 DEG C; the reaction pressure is normal pressure; and the reaction residence time is 2-10 hours. In comparison with the chloroisopentene production technology in the prior art, the preparation method provided by the invention has an advantage of simple technology and can be used to effectively prevent the generation of isoamyl dichloride during the addition reaction between hydrogen chloride and isoprene.

Description

technical field [0001] The invention relates to a method for preparing chloroisoamyl by addition reaction of isoprene and hydrogen chloride, in particular to toluene, ethylbenzene, n-hexane, cyclohexane, 2-methylpentane, 3-methylpentane One, or two, or a mixture of two or more of pentane, 2,2-dimethylbutane, 2,3-dimethylbutane, heptane, etc. as a solvent, in isoprene and hydrogen chloride A method for preventing the formation of dichloroisopentane during the addition reaction of Background technique [0002] Chloroisoamyl is a very useful raw material for fine chemical intermediates, which can be directly hydrolyzed to produce 3-methyl-2-buten-1-ol (prenyl alcohol) and 2-methyl- Mixture of 3-buten-2-ol (methylbutenol). Isopentenol is mainly used to react with trimethyl orthoacetate or ethyl acetate to synthesize methyl or ethyl perethinate, which is an important raw material for preparing pyrethroid key intermediate homo-cis permethrin. Methylbutenol is mainly used as a r...

Claims

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Application Information

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IPC IPC(8): C07C21/04C07C17/08
Inventor 赵明江赵明军孟勤标商志才
Owner 赵明江
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